Michael Jackson in This Is ItThe reviews are in for the new Michael Jackson concert rehearsal documentary 'This Is It,' which debuted to sold-out midnight screenings this morning. And, while critics' assessments range from absolutely fawning to a bit lukewarm, there seems to be a consensus on one thing: Had the King of Pop lived to launch his 'This Is It' tour in London this fall, the shows would have been worth every penny ... and MJ likely would have staged one of the most epic and glorious comebacks in music history. See what critics are saying below, then tell us what you think.